Mercurial > public > mercurial-scm > hg
annotate mercurial/posix.py @ 13890:31eb145b50b6
util: move checklink() to posix.py and return False on Windows
Python added support for Windows 6.0 (Vista) symbolic links in 3.2 [1], but
even these symbolic links aren't what we can expect from a canonical
symbolic link, since creation requires SeCreateSymbolicLinkPrivilege,
which typically only admins have.
So we can safely assume that we don't have symbolic links on Windows.
[1] http://docs.python.org/py3k/library/os.html#os.symlink
| author | Adrian Buehlmann <adrian@cadifra.com> |
|---|---|
| date | Tue, 05 Apr 2011 11:55:52 +0200 |
| parents | 5b0a3f6cbead |
| children | 98ee3dd5bab4 |
| rev | line source |
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1 # posix.py - Posix utility function implementations for Mercurial |
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2 # |
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3 # Copyright 2005-2009 Matt Mackall <mpm@selenic.com> and others |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
| 10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from i18n import _ |
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9 import osutil |
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10 import os, sys, errno, stat, getpass, pwd, grp, tempfile |
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11 |
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12 posixfile = open |
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13 nulldev = '/dev/null' |
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14 normpath = os.path.normpath |
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15 samestat = os.path.samestat |
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16 os_link = os.link |
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17 unlink = os.unlink |
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18 rename = os.rename |
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19 expandglobs = False |
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20 |
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21 umask = os.umask(0) |
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22 os.umask(umask) |
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23 |
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24 def openhardlinks(): |
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25 '''return true if it is safe to hold open file handles to hardlinks''' |
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26 return True |
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27 |
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28 def nlinks(name): |
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29 '''return number of hardlinks for the given file''' |
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30 return os.lstat(name).st_nlink |
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31 |
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32 def rcfiles(path): |
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33 rcs = [os.path.join(path, 'hgrc')] |
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34 rcdir = os.path.join(path, 'hgrc.d') |
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35 try: |
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36 rcs.extend([os.path.join(rcdir, f) |
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37 for f, kind in osutil.listdir(rcdir) |
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38 if f.endswith(".rc")]) |
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39 except OSError: |
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40 pass |
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41 return rcs |
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42 |
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43 def system_rcpath(): |
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44 path = [] |
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45 # old mod_python does not set sys.argv |
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46 if len(getattr(sys, 'argv', [])) > 0: |
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47 path.extend(rcfiles(os.path.dirname(sys.argv[0]) + |
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48 '/../etc/mercurial')) |
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49 path.extend(rcfiles('/etc/mercurial')) |
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50 return path |
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51 |
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52 def user_rcpath(): |
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53 return [os.path.expanduser('~/.hgrc')] |
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54 |
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55 def parse_patch_output(output_line): |
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56 """parses the output produced by patch and returns the filename""" |
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57 pf = output_line[14:] |
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58 if os.sys.platform == 'OpenVMS': |
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59 if pf[0] == '`': |
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60 pf = pf[1:-1] # Remove the quotes |
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61 else: |
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62 if pf.startswith("'") and pf.endswith("'") and " " in pf: |
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63 pf = pf[1:-1] # Remove the quotes |
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64 return pf |
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65 |
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66 def sshargs(sshcmd, host, user, port): |
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67 '''Build argument list for ssh''' |
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68 args = user and ("%s@%s" % (user, host)) or host |
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69 return port and ("%s -p %s" % (args, port)) or args |
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70 |
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71 def is_exec(f): |
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72 """check whether a file is executable""" |
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73 return (os.lstat(f).st_mode & 0100 != 0) |
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74 |
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75 def set_flags(f, l, x): |
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76 s = os.lstat(f).st_mode |
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77 if l: |
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78 if not stat.S_ISLNK(s): |
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79 # switch file to link |
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80 fp = open(f) |
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81 data = fp.read() |
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82 fp.close() |
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83 os.unlink(f) |
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84 try: |
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85 os.symlink(data, f) |
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86 except: |
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87 # failed to make a link, rewrite file |
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88 fp = open(f, "w") |
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89 fp.write(data) |
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90 fp.close() |
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91 # no chmod needed at this point |
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92 return |
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93 if stat.S_ISLNK(s): |
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94 # switch link to file |
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95 data = os.readlink(f) |
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96 os.unlink(f) |
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97 fp = open(f, "w") |
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98 fp.write(data) |
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99 fp.close() |
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100 s = 0666 & ~umask # avoid restatting for chmod |
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101 |
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102 sx = s & 0100 |
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103 if x and not sx: |
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104 # Turn on +x for every +r bit when making a file executable |
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105 # and obey umask. |
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106 os.chmod(f, s | (s & 0444) >> 2 & ~umask) |
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107 elif not x and sx: |
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108 # Turn off all +x bits |
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109 os.chmod(f, s & 0666) |
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110 |
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111 def checkexec(path): |
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112 """ |
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113 Check whether the given path is on a filesystem with UNIX-like exec flags |
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114 |
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115 Requires a directory (like /foo/.hg) |
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116 """ |
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117 |
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118 # VFAT on some Linux versions can flip mode but it doesn't persist |
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119 # a FS remount. Frequently we can detect it if files are created |
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120 # with exec bit on. |
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121 |
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122 try: |
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123 EXECFLAGS = stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH |
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124 fh, fn = tempfile.mkstemp(dir=path, prefix='hg-checkexec-') |
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125 try: |
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126 os.close(fh) |
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127 m = os.stat(fn).st_mode & 0777 |
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128 new_file_has_exec = m & EXECFLAGS |
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129 os.chmod(fn, m ^ EXECFLAGS) |
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130 exec_flags_cannot_flip = ((os.stat(fn).st_mode & 0777) == m) |
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131 finally: |
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132 os.unlink(fn) |
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133 except (IOError, OSError): |
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134 # we don't care, the user probably won't be able to commit anyway |
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135 return False |
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136 return not (new_file_has_exec or exec_flags_cannot_flip) |
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137 |
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138 def checklink(path): |
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139 """check whether the given path is on a symlink-capable filesystem""" |
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140 # mktemp is not racy because symlink creation will fail if the |
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141 # file already exists |
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142 name = tempfile.mktemp(dir=path, prefix='hg-checklink-') |
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143 try: |
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144 os.symlink(".", name) |
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145 os.unlink(name) |
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146 return True |
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147 except (OSError, AttributeError): |
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148 return False |
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149 |
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150 def set_binary(fd): |
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151 pass |
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152 |
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153 def pconvert(path): |
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154 return path |
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155 |
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156 def localpath(path): |
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157 return path |
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158 |
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159 def samefile(fpath1, fpath2): |
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160 """Returns whether path1 and path2 refer to the same file. This is only |
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161 guaranteed to work for files, not directories.""" |
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162 return os.path.samefile(fpath1, fpath2) |
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163 |
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164 def samedevice(fpath1, fpath2): |
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165 """Returns whether fpath1 and fpath2 are on the same device. This is only |
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166 guaranteed to work for files, not directories.""" |
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167 st1 = os.lstat(fpath1) |
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168 st2 = os.lstat(fpath2) |
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169 return st1.st_dev == st2.st_dev |
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170 |
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171 if sys.platform == 'darwin': |
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172 import fcntl # only needed on darwin, missing on jython |
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173 def realpath(path): |
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174 ''' |
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175 Returns the true, canonical file system path equivalent to the given |
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176 path. |
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177 |
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178 Equivalent means, in this case, resulting in the same, unique |
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179 file system link to the path. Every file system entry, whether a file, |
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180 directory, hard link or symbolic link or special, will have a single |
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181 path preferred by the system, but may allow multiple, differing path |
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182 lookups to point to it. |
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183 |
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184 Most regular UNIX file systems only allow a file system entry to be |
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185 looked up by its distinct path. Obviously, this does not apply to case |
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186 insensitive file systems, whether case preserving or not. The most |
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187 complex issue to deal with is file systems transparently reencoding the |
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188 path, such as the non-standard Unicode normalisation required for HFS+ |
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189 and HFSX. |
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190 ''' |
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191 # Constants copied from /usr/include/sys/fcntl.h |
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192 F_GETPATH = 50 |
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193 O_SYMLINK = 0x200000 |
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194 |
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195 try: |
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196 fd = os.open(path, O_SYMLINK) |
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197 except OSError, err: |
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198 if err.errno == errno.ENOENT: |
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199 return path |
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200 raise |
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201 |
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202 try: |
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203 return fcntl.fcntl(fd, F_GETPATH, '\0' * 1024).rstrip('\0') |
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204 finally: |
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205 os.close(fd) |
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206 else: |
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207 # Fallback to the likely inadequate Python builtin function. |
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208 realpath = os.path.realpath |
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209 |
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210 def shellquote(s): |
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211 if os.sys.platform == 'OpenVMS': |
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212 return '"%s"' % s |
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213 else: |
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214 return "'%s'" % s.replace("'", "'\\''") |
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215 |
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216 def quotecommand(cmd): |
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217 return cmd |
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218 |
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219 def popen(command, mode='r'): |
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220 return os.popen(command, mode) |
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221 |
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222 def testpid(pid): |
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223 '''return False if pid dead, True if running or not sure''' |
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224 if os.sys.platform == 'OpenVMS': |
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225 return True |
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226 try: |
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227 os.kill(pid, 0) |
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228 return True |
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229 except OSError, inst: |
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230 return inst.errno != errno.ESRCH |
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231 |
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232 def explain_exit(code): |
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233 """return a 2-tuple (desc, code) describing a subprocess status |
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234 (codes from kill are negative - not os.system/wait encoding)""" |
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235 if code >= 0: |
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236 return _("exited with status %d") % code, code |
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237 return _("killed by signal %d") % -code, -code |
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238 |
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239 def isowner(st): |
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240 """Return True if the stat object st is from the current user.""" |
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241 return st.st_uid == os.getuid() |
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242 |
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243 def find_exe(command): |
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244 '''Find executable for command searching like which does. |
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245 If command is a basename then PATH is searched for command. |
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246 PATH isn't searched if command is an absolute or relative path. |
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247 If command isn't found None is returned.''' |
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248 if sys.platform == 'OpenVMS': |
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249 return command |
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250 |
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251 def findexisting(executable): |
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252 'Will return executable if existing file' |
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253 if os.path.exists(executable): |
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254 return executable |
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255 return None |
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256 |
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257 if os.sep in command: |
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258 return findexisting(command) |
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259 |
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260 for path in os.environ.get('PATH', '').split(os.pathsep): |
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261 executable = findexisting(os.path.join(path, command)) |
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262 if executable is not None: |
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263 return executable |
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264 return None |
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265 |
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266 def set_signal_handler(): |
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267 pass |
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268 |
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269 def statfiles(files): |
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270 'Stat each file in files and yield stat or None if file does not exist.' |
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271 lstat = os.lstat |
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272 for nf in files: |
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273 try: |
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274 st = lstat(nf) |
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275 except OSError, err: |
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276 if err.errno not in (errno.ENOENT, errno.ENOTDIR): |
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277 raise |
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278 st = None |
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279 yield st |
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280 |
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281 def getuser(): |
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282 '''return name of current user''' |
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283 return getpass.getuser() |
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284 |
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285 def expand_glob(pats): |
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286 '''On Windows, expand the implicit globs in a list of patterns''' |
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287 return list(pats) |
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288 |
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289 def username(uid=None): |
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290 """Return the name of the user with the given uid. |
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291 |
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292 If uid is None, return the name of the current user.""" |
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293 |
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294 if uid is None: |
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295 uid = os.getuid() |
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296 try: |
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297 return pwd.getpwuid(uid)[0] |
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298 except KeyError: |
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|
299 return str(uid) |
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300 |
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301 def groupname(gid=None): |
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302 """Return the name of the group with the given gid. |
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303 |
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304 If gid is None, return the name of the current group.""" |
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305 |
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|
306 if gid is None: |
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307 gid = os.getgid() |
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|
308 try: |
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|
309 return grp.getgrgid(gid)[0] |
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310 except KeyError: |
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|
311 return str(gid) |
|
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serve: add and use portable spawnvp replacement
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312 |
|
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99eee847beaa
acl: grp module is not available on windows
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313 def groupmembers(name): |
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|
314 """Return the list of members of the group with the given |
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|
315 name, KeyError if the group does not exist. |
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316 """ |
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317 return list(grp.getgrnam(name).gr_mem) |
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318 |
|
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319 def spawndetached(args): |
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320 return os.spawnvp(os.P_NOWAIT | getattr(os, 'P_DETACH', 0), |
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|
321 args[0], args) |
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322 |
|
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Find right hg command for detached process
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|
323 def gethgcmd(): |
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Find right hg command for detached process
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|
324 return sys.argv[:1] |
|
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util: fix default termwidth() under Windows
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325 |
|
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termwidth: move to ui.ui from util
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326 def termwidth(): |
|
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327 try: |
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|
328 import termios, array, fcntl |
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|
329 for dev in (sys.stderr, sys.stdout, sys.stdin): |
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330 try: |
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|
331 try: |
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332 fd = dev.fileno() |
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|
333 except AttributeError: |
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|
334 continue |
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|
335 if not os.isatty(fd): |
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|
336 continue |
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|
337 arri = fcntl.ioctl(fd, termios.TIOCGWINSZ, '\0' * 8) |
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338 return array.array('h', arri)[1] |
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339 except ValueError: |
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Patrick Mezard <pmezard@gmail.com>
parents:
10264
diff
changeset
|
340 pass |
|
18e81d42ee5c
util: fix default termwidth() under Windows
Patrick Mezard <pmezard@gmail.com>
parents:
10264
diff
changeset
|
341 except IOError, e: |
|
18e81d42ee5c
util: fix default termwidth() under Windows
Patrick Mezard <pmezard@gmail.com>
parents:
10264
diff
changeset
|
342 if e[0] == errno.EINVAL: |
|
18e81d42ee5c
util: fix default termwidth() under Windows
Patrick Mezard <pmezard@gmail.com>
parents:
10264
diff
changeset
|
343 pass |
|
18e81d42ee5c
util: fix default termwidth() under Windows
Patrick Mezard <pmezard@gmail.com>
parents:
10264
diff
changeset
|
344 else: |
|
18e81d42ee5c
util: fix default termwidth() under Windows
Patrick Mezard <pmezard@gmail.com>
parents:
10264
diff
changeset
|
345 raise |
|
18e81d42ee5c
util: fix default termwidth() under Windows
Patrick Mezard <pmezard@gmail.com>
parents:
10264
diff
changeset
|
346 except ImportError: |
|
18e81d42ee5c
util: fix default termwidth() under Windows
Patrick Mezard <pmezard@gmail.com>
parents:
10264
diff
changeset
|
347 pass |
|
18e81d42ee5c
util: fix default termwidth() under Windows
Patrick Mezard <pmezard@gmail.com>
parents:
10264
diff
changeset
|
348 return 80 |